Automatic gas-burner cut-off.



No. 643,363. Patented Feb. I3, |900.

F. H. OEHLKE.

AUTOMATIC GAS BURNER CUT-OFF.

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tra TATES FREDRIOK H. OEHLKE, OF LIORAIN, OHIO.

`AUTOMATIC GAS-,BURN ER C LlJT-OFF.

SPECIFICATION forming part of Letters Patent No. 643,363, dated February 13, 1900.

Application filed November 21, 1898. Serial No. 697,046. (No model.)

To all whom, t may conceive:

Be it known that I, FREDRICK H. OEHLKE, a citizen of the United States, residing at Lorain, in the county of Lorain and State of Ohio, have invented a new and useful Automatic Gas-Burner Cut-Oif, of which the following is a specification.

My invention relates to burners adapted to consume gaseous fuel, such as natural or artiiicial gas or a gas generated from a liquid hydrocarbon; and the object of the invention is to provide means which will automatically close the burner against the passage of the gas should the flame become extinguished from any cause.

The invention consists in an automatic cu toff for the purpose specied embodying certain novel features and details of construction and arrangement of parts, as hereinafter fully described, illustrated in` the drawings, and incorporated in the claim.

To enable others to understand the invention, a preferred embodiment thereof is illustrated in the accompanying drawings, forming a partof this specification, and in which- Figure l is a vertical sectional elevation of one type of a gas-burner with my improvements associated therewith. Fig. 2 is a sectional elevation of another embodiment of the invention.

Like numerals of reference denote like and corresponding parts in each of the figures of the drawings.

5 designates the vertical thermostatic tube, which serves as a conduit for the gaseous fuel or the liquid hydrocarbon, and this tube is made of a sheet met-al, preferably of brass, which is readily extensible under the infinence of heat. At its upper end this thermostatic tube is provided with a detachable cap threaded vthereon and having an interior valve-seat 6, and to the lower end of said tube 5is detachably secured a union 8. The union is in the form of a cross connection or coupling having one arm thereof screwed to the tube 5, and the vertical arm 8 of this union is interiorly threaded to support the vertical valve-spindle 9, which is arranged longitudinally and centrally within the expansible tube 5. This valve-stem is made of a metal which is not expansible under the influence of heat so readily as the thermostatic tube 5', within which it is inclosed, and in practice I may make this valvestem of iron or gunmetal, although other materials may be employed. The valve-stem is provided near its lower end with a male screw-thread 10, by which the stem maybe screwed into the arm 8 of the union, so as to be fast therewith, and the lower extremity of this valve-stem is of square orpolygonal form, as at 12, so as to protrude beyond the union and furnish a convenient means by which the stem may be adjusted longitudinally within certain limits inside of the expansible tube.

The upper end of the vertical stem 9 is enlarged to form or is provided with a valve-head 13, the working face of which is beveled or made cone-shaped, so as to fit tightly against the valve-seat 6 within the expansible tube, at the upper end of the latter. The valve-stem may be adjusted within the expansible tube in order that the head of said stem may accurately iit the valve-seat 6, and the stem and expansible tube are thus mutually adapted to each other to enable the gas or liquid passage through the tube to be tightly closed when said tube is in a cold condition.

As the means for initially expanding the thermostatic tube, so that the valve-seat 6 is drawn away from the valve-head 13 to permit of the passage of the gas or liquid through the tube 5, I provide the external oil-cup 14. This oil-cup is of annular cup-shaped formation, and it is fast with the thermostatic tube 5 at a point intermediate of its length. The oil-cup may be made of cast or sheet metal, and it is unitedexternally to the vertical tube 5 in any approved Way. This oil-cup surrounds the tube 5 at a point intermediate of its length, and said cup is adapted to receive a liquid hydrocarbon, which when ignited emits aiiame that impinges against the eX- pansible tube for a portion of its length, whereby the tube -is adapted to be expanded to a sufficient extent to draw its valve-seat away from the valve-head 13 and open the passage through the tube 5.

The union 7 is provided with an inlet at one side thereof, to which may be connected a pipe adapted to convey gas ora hydrocarbon liquid to the tube 5, as indicated by the arrows IOO in Fig. 1, and, it desired, the other arm of this union may be closed by a suitable cap or another pipe may be attached thereto.

In Fig. 1 ot' the drawings I have represented my improved cut-off in connection with a burner adapted to consume the gaseous fuel supplied by the tube 5, and, as represented, a pipe 16 is connected with the vertical tube 5 by a passage or flue 17, which is arranged above the valve-seat 6. This pipe 16 has a cleaning-plug 18, by which access may be 0b'- tained to the interior of the fuel-passagein the upper part of said thermostatic tube and the pipe 16, and said pipe discharges into a valved fuel-supply tube 19, which is shown as extending transversely across the tube 5, at one side thereof. At one'end this fuel-supply shell has an outlet-port 20, adapted to be closed by the pointed extremity ot' a needlevalv'e 2l, Which is manipulated by a handwheel or other suitable device, as shown, and this needle-valve is arranged to discharge to the inlet-elbow 22 of a burner 23.

The embodiment .of the invention represented by Fig. 1 is Well adapted for use in connection With the burner of a vapor-stove adapted to consume gaseous fuel; but I Would have it understood that my invention is not restricted to any particular type of burner.

It is to be observed, by reference to Fig. 1, that the elbow-shaped vapor connection, the casing 19, having the needle-valve, and the upper part of the thermostatic tube are all disposed Within the zone of the iiame emitted from the starting-cup, so that all these parts may be heated preliminary to the operation of starting the burner into service.

An important feature of my invention cone sists in the employment of the needle-valve casing 19, coupled to the elbow-shaped vapor connection for communication therewith, and having the needle-like orifice disposed contiguous to` and in axial alinement with the open mouth of the burner supply-tube 22, said end of the needle-valve casing being spaced with relation to the mouth of the burner supply-tube for the purpose of permitting the vapor under pressure to escape from the needle-valve casing and to rush into the open end ot the supply-tube 22, whereby atmospheric air is entrained` along with the vapor into the burner supply-tube. This insures the proper admixture of the vapor with air to support combustion at the burner.

Changes may be made in the form and proportion of some of the parts, While their essential features are retained and the spirit of the invention embodied. Hence I do not desire to be limited to the precise form of all the parts as shown, reserving the right to vary therefrom.

What I claim is- A burner for oil and Vapor stoves comprising a single vertical thermostatic tube provided at its upper end With an internal Valveseat, a coupling at the lower end of said tube, an elbow1 vapor connection at the upper end of said tube, a valve-stem xedly supported in the coupling and having a valve head adapted to the seat of said tube, an external cup surrounding the tube at a point intermediate of its lengt-h, a burner supply-tube having an open mouth for free admission of atmospheric air at a point adjacent to the tube, and a valved casing coupled to the vapor connection and having a needle-like orifice disposed-adjacent to and in axial alinement with the air-admission mouth of the burner-tube; said valved casing, the vapor connection and the upper part of the tube being within the zone of the lame emitted from the external cup, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

FREDRICK II. OEHLKE.

lVitnesses:

WALTER A. BoNsoR. W. B. THOMPSON. 

